A 15-inch HMS Tiger against the German battlecruisers

How would a 15-inch-gunned HMS Tiger affect Scharnhorst and Gneisenau in the Norwegian campaign?

The heavier Tiger would substantially improve British combat power and could reshape subsequent Royal Navy capital-ship construction choices.

A 15-inch Tiger is estimated at roughly 32,000 tons while retaining a speed above 28 knots. Her heavier battery could cause more damage in the First World War, including at Dogger Bank, and her descendants would change the force facing Scharnhorst and Gneisenau. Follow-on ships ordered alongside the Queen Elizabeth and R classes could alter whether Renown and Repulse were converted from battleship orders. One possible outcome retains all eight planned R-class battleships; another combines two improved Tigers with the two historical conversions. With four 15-inch battlecruisers already available, the Admiral design might become a 28-knot fast battleship with twelve 15-inch guns. That speculative construction path leaves Britain with four fast battleships, four 15-inch battlecruisers, and ten conventional battleships after the war. Such a fleet might produce a treaty that limited continuing construction instead of imposing a building holiday. The Norwegian campaign would then involve a much larger British fast force, making the result depend on decades of changed construction rather than one replacement ship.